There is a whole industry of search engine optimization and social media experts, and many of them have found jobs at Web publishers. Their standard strategies include things like filling articles with keywords that people might search for, writing teaser headlines that people cannot help but click on and including copious links to other stories on the same site.

In addition to writing articles based on trending Google searches, The Huffington Post writes headlines like a popular one this week, “Watch: Christina Aguilera Totally Messes Up National Anthem.” It amasses often-searched phrases at the top of articles, like the 18 at the top of the one about Ms. Aguilera, including “Christina Aguilera National Anthem” and “Christina Aguilera Super Bowl.”

As a result of techniques like these, 35 percent of The Huffington Post’s visits in January came from search engines, compared to 20 percent for CNN.com, according to Hitwise, a Web analysis firm.